384 lines
15 KiB
C
384 lines
15 KiB
C
/***************************************************************************/
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/* */
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/* ttdriver.c */
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/* */
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/* TrueType font driver implementation (body). */
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/* */
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/* Copyright 1996-2001, 2002, 2003, 2004, 2005, 2006 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#include <ft2build.h>
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#include FT_INTERNAL_DEBUG_H
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#include FT_INTERNAL_STREAM_H
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#include FT_INTERNAL_SFNT_H
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#include FT_TRUETYPE_IDS_H
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#include FT_SERVICE_XFREE86_NAME_H
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#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
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#include FT_MULTIPLE_MASTERS_H
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#include FT_SERVICE_MULTIPLE_MASTERS_H
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#endif
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#include "ttdriver.h"
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#include "ttgload.h"
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#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
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#include "ttgxvar.h"
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#endif
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#include "tterrors.h"
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/*************************************************************************/
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/* */
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/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
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/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
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/* messages during execution. */
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/* */
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#undef FT_COMPONENT
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#define FT_COMPONENT trace_ttdriver
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/**** ****/
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/**** ****/
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/**** F A C E S ****/
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/**** ****/
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/**** ****/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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#undef PAIR_TAG
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#define PAIR_TAG( left, right ) ( ( (FT_ULong)left << 16 ) | \
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(FT_ULong)right )
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/*************************************************************************/
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/* */
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/* <Function> */
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/* tt_get_kerning */
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/* */
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/* <Description> */
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/* A driver method used to return the kerning vector between two */
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/* glyphs of the same face. */
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/* */
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/* <Input> */
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/* face :: A handle to the source face object. */
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/* */
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/* left_glyph :: The index of the left glyph in the kern pair. */
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/* */
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/* right_glyph :: The index of the right glyph in the kern pair. */
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/* */
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/* <Output> */
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/* kerning :: The kerning vector. This is in font units for */
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/* scalable formats, and in pixels for fixed-sizes */
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/* formats. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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/* <Note> */
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/* Only horizontal layouts (left-to-right & right-to-left) are */
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/* supported by this function. Other layouts, or more sophisticated */
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/* kernings, are out of scope of this method (the basic driver */
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/* interface is meant to be simple). */
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/* */
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/* They can be implemented by format-specific interfaces. */
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/* */
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static FT_Error
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tt_get_kerning( FT_Face ttface, /* TT_Face */
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FT_UInt left_glyph,
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FT_UInt right_glyph,
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FT_Vector* kerning )
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{
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TT_Face face = (TT_Face)ttface;
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SFNT_Service sfnt = (SFNT_Service)face->sfnt;
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kerning->x = 0;
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kerning->y = 0;
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if ( sfnt )
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kerning->x = sfnt->get_kerning( face, left_glyph, right_glyph );
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return 0;
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}
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#undef PAIR_TAG
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/**** ****/
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/**** ****/
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/**** S I Z E S ****/
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/**** ****/
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/**** ****/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
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static FT_Error
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tt_size_select( FT_Size size,
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FT_ULong strike_index )
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{
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TT_Face ttface = (TT_Face)size->face;
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TT_Size ttsize = (TT_Size)size;
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FT_Error error = TT_Err_Ok;
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ttsize->strike_index = strike_index;
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if ( FT_IS_SCALABLE( size->face ) )
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{
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/* use the scaled metrics, even when tt_size_reset fails */
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FT_Select_Metrics( size->face, strike_index );
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tt_size_reset( ttsize );
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}
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else
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{
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SFNT_Service sfnt = ttface->sfnt;
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FT_Size_Metrics* metrics = &size->metrics;
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error = sfnt->load_strike_metrics( ttface, strike_index, metrics );
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if ( error )
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ttsize->strike_index = 0xFFFFFFFFUL;
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}
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return error;
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}
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#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
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static FT_Error
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tt_size_request( FT_Size size,
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FT_Size_Request req )
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{
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TT_Face ttface = (TT_Face)size->face;
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TT_Size ttsize = (TT_Size)size;
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FT_Error error = TT_Err_Ok;
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#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
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if ( FT_HAS_FIXED_SIZES( size->face ) )
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{
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SFNT_Service sfnt = ttface->sfnt;
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FT_ULong index;
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error = sfnt->set_sbit_strike( ttface, req, &index );
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if ( error )
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ttsize->strike_index = 0xFFFFFFFFUL;
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else
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return tt_size_select( size, index );
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}
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#endif /* TT_CONFIG_OPTION_EMBEDDED_BITMAPS */
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FT_Request_Metrics( size->face, req );
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if ( FT_IS_SCALABLE( size->face ) )
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error = tt_size_reset( ttsize );
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return error;
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}
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/*************************************************************************/
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/* */
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/* <Function> */
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/* Load_Glyph */
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/* */
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/* <Description> */
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/* A driver method used to load a glyph within a given glyph slot. */
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/* */
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/* <Input> */
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/* slot :: A handle to the target slot object where the glyph */
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/* will be loaded. */
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/* */
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/* size :: A handle to the source face size at which the glyph */
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/* must be scaled, loaded, etc. */
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/* */
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/* glyph_index :: The index of the glyph in the font file. */
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/* */
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/* load_flags :: A flag indicating what to load for this glyph. The */
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/* FTLOAD_??? constants can be used to control the */
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/* glyph loading process (e.g., whether the outline */
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/* should be scaled, whether to load bitmaps or not, */
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/* whether to hint the outline, etc). */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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static FT_Error
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Load_Glyph( FT_GlyphSlot ttslot, /* TT_GlyphSlot */
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FT_Size ttsize, /* TT_Size */
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FT_UInt glyph_index,
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FT_Int32 load_flags )
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{
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TT_GlyphSlot slot = (TT_GlyphSlot)ttslot;
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TT_Size size = (TT_Size)ttsize;
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FT_Error error;
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if ( !slot )
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return TT_Err_Invalid_Slot_Handle;
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if ( !size )
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return TT_Err_Invalid_Size_Handle;
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if ( load_flags & ( FT_LOAD_NO_RECURSE | FT_LOAD_NO_SCALE ) )
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{
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load_flags |= FT_LOAD_NO_HINTING |
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FT_LOAD_NO_BITMAP |
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FT_LOAD_NO_SCALE;
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}
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/* now load the glyph outline if necessary */
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error = TT_Load_Glyph( size, slot, glyph_index, load_flags );
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/* force drop-out mode to 2 - irrelevant now */
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/* slot->outline.dropout_mode = 2; */
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return error;
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}
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/**** ****/
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/**** ****/
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/**** D R I V E R I N T E R F A C E ****/
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/**** ****/
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/**** ****/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
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static const FT_Service_MultiMastersRec tt_service_gx_multi_masters =
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{
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(FT_Get_MM_Func) NULL,
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(FT_Set_MM_Design_Func) NULL,
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(FT_Set_MM_Blend_Func) TT_Set_MM_Blend,
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(FT_Get_MM_Var_Func) TT_Get_MM_Var,
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(FT_Set_Var_Design_Func)TT_Set_Var_Design
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};
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#endif
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static const FT_ServiceDescRec tt_services[] =
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{
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{ FT_SERVICE_ID_XF86_NAME, FT_XF86_FORMAT_TRUETYPE },
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#ifdef TT_CONFIG_OPTION_GX_VAR_SUPPORT
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{ FT_SERVICE_ID_MULTI_MASTERS, &tt_service_gx_multi_masters },
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#endif
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{ NULL, NULL }
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};
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FT_CALLBACK_DEF( FT_Module_Interface )
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tt_get_interface( FT_Module driver, /* TT_Driver */
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const char* tt_interface )
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{
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FT_Module_Interface result;
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FT_Module sfntd;
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SFNT_Service sfnt;
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result = ft_service_list_lookup( tt_services, tt_interface );
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if ( result != NULL )
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return result;
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/* only return the default interface from the SFNT module */
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sfntd = FT_Get_Module( driver->library, "sfnt" );
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if ( sfntd )
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{
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sfnt = (SFNT_Service)( sfntd->clazz->module_interface );
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if ( sfnt )
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return sfnt->get_interface( driver, tt_interface );
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}
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return 0;
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}
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/* The FT_DriverInterface structure is defined in ftdriver.h. */
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FT_CALLBACK_TABLE_DEF
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const FT_Driver_ClassRec tt_driver_class =
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{
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{
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FT_MODULE_FONT_DRIVER |
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FT_MODULE_DRIVER_SCALABLE |
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#ifdef TT_CONFIG_OPTION_BYTECODE_INTERPRETER
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FT_MODULE_DRIVER_HAS_HINTER,
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#else
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0,
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#endif
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sizeof ( TT_DriverRec ),
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"truetype", /* driver name */
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0x10000L, /* driver version == 1.0 */
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0x20000L, /* driver requires FreeType 2.0 or above */
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(void*)0, /* driver specific interface */
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tt_driver_init,
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tt_driver_done,
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tt_get_interface,
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},
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sizeof ( TT_FaceRec ),
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sizeof ( TT_SizeRec ),
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sizeof ( FT_GlyphSlotRec ),
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tt_face_init,
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tt_face_done,
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tt_size_init,
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tt_size_done,
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tt_slot_init,
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0, /* FT_Slot_DoneFunc */
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tt_size_request,
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#ifdef TT_CONFIG_OPTION_EMBEDDED_BITMAPS
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tt_size_select,
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#else
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0, /* FT_Size_SelectFunc */
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#endif
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Load_Glyph,
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tt_get_kerning,
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0, /* FT_Face_AttachFunc */
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0 /* FT_Face_GetAdvancesFunc */
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};
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/* END */
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